diff --git a/web/build.sh b/web/build.sh
index 655225d..e799aac 100755
--- a/web/build.sh
+++ b/web/build.sh
@@ -16,19 +16,11 @@ fi
 
 mkdir -p dist
 
-# Build JS bundle
-${NPX:+$NPX} esbuild src/app.jsx \
-  --bundle \
-  --minify \
-  --jsx-factory=h \
-  --jsx-fragment=Fragment \
-  --define:process.env.NODE_ENV=\"production\" \
-  --external:preact \
-  --outfile=dist/app.js \
-  2>/dev/null || \
+# Build JS bundle — preact must be bundled (no CDN/external loader)
 ${NPX:+$NPX} esbuild src/app.jsx \
   --bundle \
   --minify \
+  --format=esm \
   --jsx-factory=h \
   --jsx-fragment=Fragment \
   --define:process.env.NODE_ENV=\"production\" \
diff --git a/web/dist/app.js b/web/dist/app.js
index 3205565..8ad82e7 100644
--- a/web/dist/app.js
+++ b/web/dist/app.js
@@ -1,2 +1,2 @@
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diff --git a/web/dist/index.html b/web/dist/index.html
index 282793f..13cfc93 100644
--- a/web/dist/index.html
+++ b/web/dist/index.html
@@ -8,6 +8,6 @@
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   <div id="root"></div>
-  <script src="/app.js"></script>
+  <script type="module" src="/app.js"></script>
 </body>
 </html>
diff --git a/web/src/index.html b/web/src/index.html
index 282793f..13cfc93 100644
--- a/web/src/index.html
+++ b/web/src/index.html
@@ -8,6 +8,6 @@
 </head>
 <body>
   <div id="root"></div>
-  <script src="/app.js"></script>
+  <script type="module" src="/app.js"></script>
 </body>
 </html>